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Preparation method for iron-based super conductor

A technology of iron powder and compaction, applied in the field of preparation of iron-based superconductors, can solve the problems of low sample density, poor grain connectivity, low phase purity, etc., to reduce the generation of impurity phases, improve electromagnetic performance, and improve practical sexual effect

Active Publication Date: 2013-07-31
深创超导(深圳)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, it should also be noted that iron-based superconducting materials still have problems such as low critical current density, low sample density, poor grain connectivity and low phase purity, which greatly limit their practical application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Step 1: In an argon atmosphere glove box, Fe powder and As powder are mixed according to the molar ratio of 1:1, 0.9384 g of Fe powder and 1.259 g of As powder are weighed, and fully mixed. Fill the powder into a mold, press it into a block with a hydraulic press, put it into a quartz tube, and vacuum seal it. The quartz tube was placed in an annealing furnace and kept at 800°C for 20 hours. After the furnace was cooled to room temperature, it was taken out to obtain FeAs.

[0026] Step 2: In an argon atmosphere glove box, mix K chips and FeAs powder in a molar ratio of 1:2, weigh 0.1643 grams of K chips and 1.0987 grams of FeAs powder, mix well, fill the powder into a mold, and press it with a hydraulic press Into a block, put it into a quartz tube, and vacuum seal it. Place the quartz tube in an annealing furnace and keep it at 700°C for 20 hours. After the furnace is cooled to room temperature, it is taken out to obtain KFe 2 As 2 .

[0027] Step 3: In an argon...

Embodiment 2

[0031] Step 1: In an argon atmosphere glove box, Fe powder and As powder are mixed according to the molar ratio of 1:1, 1.0575 g of Fe powder and 1.4189 g of As powder are weighed and fully mixed. Fill the powder into a mold, press it into a block with a hydraulic press, put it into a quartz tube, and vacuum seal it. The quartz tube was placed in an annealing furnace and kept at 800°C for 20 hours. After the furnace was cooled to room temperature, it was taken out to obtain FeAs.

[0032] Step 2: In an argon atmosphere glove box, put Na chips and FeAs powder in a molar ratio of 1:2, weigh 0.1089 grams of Na chips and 1.2382 grams of FeAs powder, mix well, fill the powder into a mold, and press it with a hydraulic press Into a block, put it into a quartz tube, and vacuum seal it. Place the quartz tube in an annealing furnace and keep it at 700°C for 20 hours. After the furnace is cooled to room temperature, it is taken out to obtain NaFe 2 As 2 .

[0033] Step 3: In an ar...

Embodiment 3

[0037] Step 1: In an argon atmosphere glove box, Fe powder and As powder are mixed according to the molar ratio of 1:1, 0.941567 g of Fe powder and 1.263319 g of As powder are weighed, and fully mixed. Fill the powder into a mold, press it into a block with a hydraulic press, put it into a quartz tube, and vacuum seal it. The quartz tube was placed in an annealing furnace and kept at 800°C for 20 hours. After the furnace was cooled to room temperature, it was taken out to obtain FeAs.

[0038] Step 2: In an argon atmosphere glove box, Ni powder and As powder are mixed according to the molar ratio of 1:1, 0.1746 g of Ni powder and 0.2230 g of As powder are weighed, and fully mixed. Fill the powder into a mold, press it into a block with a hydraulic press, put it into a quartz tube, and vacuum seal it. The quartz tube was placed in an annealing furnace and kept at 800°C for 20 hours. After the furnace was cooled to room temperature, it was taken out to obtain NiAs.

[0039] ...

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PUM

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Abstract

A preparation method for an iron-based super conductor belongs to the technical field of iron-based super conducting materials. A1-xBxFe2As2 (A=Ba, Sr, Ca, Eu, and B=K, Na) and AFe2-xBxAs2 (A=Ba, Sr, Ca, Eu, and B=Co, Ni, Pd, Pt, Ir, Rh, Ru) are prepared, wherein 0<x<=0.7. For the A1-xBxFe2As2, FeAs is prepared first, then AFe2As2 and BFe2As2 are prepared respectively, and the FeAs, the AFe2As2 and the BFe2As2 are mixed and sintered to obtain the A1-xBxFe2As2. For AFe2-xBxAs2, FeAs and BAs are prepared first, then AFe2As2 and AB2As2 are prepared respectively, and the FeAs, the BAs, the AFe2As2 and the AB2As2 are mixed and sintered to obtain the AFe2-xBxAs2. A reacting process can be controlled by means of step reaction, generation of an impure phase is reduced, electromagnetic performanceof the iron-based super conductor is improved, and practicality is improved.

Description

technical field [0001] The invention relates to a preparation method of an iron-based superconductor, belonging to the technical field of iron-based superconductor materials. Background technique [0002] In early 2008, Hosono of Tokyo Institute of Technology and his collaborators reported that the iron-arsenic compound LaFeAsO 1-x f x With superconductivity, the superconducting transition temperature reaches 26K. This has aroused widespread concern in the condensed matter physics community, followed by a new round of research on high-temperature superconductivity. In just a few months, the superconducting transition temperature of iron-based superconductors has been raised to above 50K, and there have been more than a thousand research papers on iron-based superconductors. [0003] According to the composition ratio and crystal structure of the parent compound, new superconducting materials are mainly divided into four categories: 1111 system with ZrCuSiAs structure, ThC...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B13/00H01B12/04
CPCY02E40/641Y02E40/60
Inventor 索红莉闫镔杰王毅马麟刘志勇郭志超袁冬梅
Owner 深创超导(深圳)科技有限公司
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